Perfect Computer Notes

What is Hardware? The physical parts of a computer are called hardware. Hardware can be touched or seen by us. For example, hard disk, mouse, keyboard, CD, CD-ROM Drive, Floppy Disk, Speakers, Modem and Printers - all are computer hardware. Explain different types of computer hardware Different types of hardware components on the basis of the functionality  they provide are as follows: 1.    Input devices Input devices are used to enter data and instructions into computer. Examples of input devices are: Keyboard, mouse, scanner, digital camera etc. Microphone Mouse Keyboard 2.    The Central Processing unit Central processing unit is the brain of the computer . It is also called CPU or Processor. Intel is the leading manufacturer of microprocessors. For example, Intel Pentium IV 3.2 MHz is an example of a CPU. You can see the images of processors / Micro processors or CPUs. Images of CPU or Microprocessor or simply Processor 3.    Output de

The differences between analog and digital computers are as follows: Analog Computers Digital Computers 1 Analog Computers Work on continuous values. Digital computers Work on discrete values. 2 Analog Computers have low memory . Digital computers have a very large memory 3 Analog computers have Slow speed. Digital computers have fast speed. 4 Analog computers are less reliable. Digital computers are more reliable. 5 Analog computers used in engineering and science and medical fields. Digital computers are used in all fields of life. 6 Analog computers are used to calculate / measure analog quantities like speed and temperature. Digital computers are used to calculate math

Computers are used in industry in different types of systems. Computer-Controlled Robots are Used in Industry Computer-controlled robots are used to perform many complicated jobs in industry. Robots are computer controlled programmable machines. They can perform mechanical jobs, too, like pick and place different parts, welding or painting cars etc. Different Uses of Computers in Industry  Automated Production Systems Today, computer-controlled robots are used to assemble cars. No doubt, these systems work faster than human beings. Another popular and efficient use for computer controlled robots is in the field of spray painting. The consistency and repeatability of a robot's motion have enabled near perfect quality painting while at the same time wasting no paint and leaving no place without paint. Uses of computers in industry area     Perhaps the most popular applications of robots are in industrial welding. The repeat-ability, uniformity in quality, a

Today Computers are an essential part of an hospital . Doctors and administration staff uses computers to manage patient history and medicine stocks etc. Computers play a key role in the medical field .  Their uses include storing patient related data, housing knowledge bases, providing the logic and circuitry for medical equipment, scanning and imaging the body, and facilitating speedy communications. Computers can be used in medical field in the following ways: Uses of Computers in Medical Field Top Seven Uses of Computers in Medical Field    Hospital Administration These days, Computers are being used in hospitals extensively . We can computerize the accounting, payroll and stock system of the hospital. We can keep the record of different medicines.  Recording Medical History Of Patients Computer can be used to store the medical history of the patients . Medical history is very important for patients as well as doctors. Doctors may better prescribe th

Computer can be used in education in the following ways:  Computers In Teaching and Learning Process ( Computer Aided Learning - CAL ) Computers are being used actively in educational institutes to improve the learning process. Teachers can use audio video aids through computer to prepare lesson plans. They can use Microsoft Power Point to prepare electronic presentations about their lectures. These electronic presentations will be displayed on multimedia projectors in class rooms. This will be interesting and easy to learn for students. Multimedia presentations are easy to deliver for teachers too, These presentations save a lot of effort and time. Moreover multimedia presentations are interesting to view and hear sound and visual  effects. Computers will be helpful for:                        Instructing the students using PowerPoint slides, Word documents or Web pages and using hyperlinks for better concept clarity.      2.  Helps in improving pronunciation of

Now-a-days, computers are the essential part of any business organization. Computers are used in business companies for performing different tasks like Record Maintaining, Stock management, Pay Roll Systems, Business Correspondence and Business Communication etc,  Computer can be used in business in the following ways: Explain Different Uses of Computers in Business Organizations Employee Record Keeping All business organizations keep record of their employees. Computers are being used extensively to make this task easier and more efficient. For example, computers are being used to keep records of : Uses of computers in business Daily attendance of employees Recording overtime hours of employees Recording Total hours worked of all employees Calculating Pay of employees Printing pay bills and receipts every month   Marketing    Any business organization can use computers for marketing their products. Stock Exchange Many stock exchanges

A system is a set of inter related components that work together to fulfill a purpose. For example a Road Transportation System will consist of the parts - roads, vehicles- trucks, buses, vans, cars etc, passengers, the staff for ticketing and maintenance of vehicles and roads etc. And the transportation system will fulfill the purpose of carrying of passengers and luggage from place to place. Similarly, a computer system consists of many components that work together to fulfill the purpose of data processing. A Computer system consists of the following four parts: 1.    Hardware 2.    Software 3.    Data 4.    User 1.    Hardware The mechanical devices that makeup the computer are called HARDWARE , for example, Keyboard, hard disk, monitor, processor and mother board etc. Hardware are physical devices . They can be touched. Hardware device are interconnected and perform input, processing and output operations. 2.    Software Software is the set of instructions given